Improved car-spring



J. W. EVANS.

on SPRING.

No. 64,087. Patented Apr. 23, 1867.

UNITED STATES PATENT OFFICE.

' JAMES W. EVANS, OF NEW YORK, N. Y.

IMPROVED CAR-SPRING.

Specification forming part of Letters Patent No; 64.087, dated April 23, 1867.

To whom it may concern.-

Be it known that I, JAMES W. EVANS, of the city, county, and State of New York, have invented a certain new and useful Improvement in Springs for Railway-Oars and other purposes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 represents a vertical central section of a double springillnstrating my invention. Fig. 2 is an inside view of the cover of the box of the spring. 4

Similar letters of reference indicate corresponding parts in both figures.

.In the construction of spiral springs for railway-cars and other purposes it has heretofore been customary to flatten the terminal coils of the spring in such manner that they would rest upon bearings perpendicular to the axis of the helix of the spring. This flattening of the terminal coils has commonly been accom- .plished by grinding down the springs after they have been coiled and tempered. The grinding not only occupies much time, and is therefore a costly process, but it, in many cases, so heats the spring as to injure its vtemper.

The object of my invention. is to provide bearings for the whole circumference of the terminal coils of the spring without the necessityof flattening them; and to this end it consists in the casting of spiral-surfaced recesses for the reception of the ends of the spring in the bottom and cover of the cast-iron box in which the spring is placed, or in any other cast-metal bearing-pieces between which the spring is placed.

To enable others skilled in the art to apply my invention to use, I will proceed to describe it with reference to the drawings.

The box A, Fig. 1, is made with two circular compartments, each one of such a size as to receive a spiral spring, B, in such manner that when the spring is compressed it will not come in contact with the surrounding sides a of its respective compartment. The bottom I), Fig. 1, of each compartment is cast with a circular spiral surface recess or groove, as shown at c, Fig. 1, of such shape as to form a bearing for nearly the whole of the lower terminal spiral coil of the spring. 0 is the cover of the box A, having cast in the interior of its head two circular spiral-surfaced recesses or grooves, e 0, like the recesses or grooves c c in the bottom of the box for the reception of the upper terminal coils'of the springs B B. This cover 0 is fitted to the box A in such a manner that the inside of the surrounding rim f of the cover will slide over and on the outside of the surrounding sides a, Fig. 1, of the box. The cover 0 and box A are fastened together by means of a bolt, D, Fig. 1, and nut g. This bolt D is put through the partition h, Fig. 1, which separates the two compartments containing the springs B B.- The partition h of thebox A has a hole, E, Fig. 1, of sufficient depth in the bottom to allow the head i of the bolt D to vibrate in. This box may be made so as to contain but one spring or a number of them. By casting in the bottom of the box and the head of its cover the spiral-surfaced recesses o c and e e, not only is the necessity for flattening the terminal coils of the spring obviated, but better bearings for the spring are obtained, and the spring is prevented from turning by its extremities coming in contact with the deeper ends 0' and e of the recesses c and e.

What I claim as my invention, and desire to secure by Letters Patent, is-

The spiral-surfaced grooves c and e'for the reception of the terminal coils of the spring, cast in the bottom of the box A and head of its cover 0. or in any other cast-metal bearin gs provided for the spring, substantially as herein specified.

JAMES W. EVANS. Witnesses:

J. W. 0001mm, HENRYT. BROWN. 

